Abstract
Light shelves are considered to be the simplest of the daylighting systems. This chapter describes the daylighting performance of two light shelves, both used as shading and daylighting devices, using l, 10 models. One of the light shelves is made of opaque metacrilate and the other is essentially a mirror. Three types of models are used with different reflectance for walls namely ceiling and floor. Experiments are performed with each of the three types of models. The chapter also analyzes mean hourly illuminance measurements obtained at 50 cm from a south facing side window in the line perpendicular to the window at its middle point for skies with hourly sunshine fraction σ = l. Plots for the measured illuminance against the day of the year for 11 a.m. to 12 a.m., true solar time, are fitted with the 5th degree polynomials, and the fits obtained for the different types of models and light shelves are compared.
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